1
GATE ECE 1991
MCQ (More than One Correct Answer)
+2
-0.6
The electric field component of a uniform plane electromagnetic wave propagating in the $$Y$$-direction in a lossless medium will satisfy the equation
A
$${{{\partial ^2}{E_y}} \over {\partial \,{y^2}}} = \mu \in {{{\partial ^2}{E_y}} \over {\partial \,{t^2}}}$$
B
$${{{\partial ^2}{E_y}} \over {\partial \,{x^2}}} = \mu \in {{{\partial ^2}{E_y}} \over {\partial \,{t^2}}}$$
C
$${{{\partial ^2}{E_x}} \over {\partial \,{y^2}}} = \mu \in {{{\partial ^2}{E_x}} \over {\partial \,{t^2}}}$$
D
$${{\sqrt {E_x^2 + E_z^2} } \over {\sqrt {H_x^2 + H_z^2} }} = \sqrt {\mu / \in }$$
2
GATE ECE 1991
+2
-0.6
The input impedance of a short-circuited lossless transmission line guarter wave long is
A
purely reactive
B
purely resistive
C
infinite
D
dependent on the characteristic impedance of the line
3
GATE ECE 1991
Subjective
+8
-0
A uniform plane electromagnetic wave traveling in free-space enters into a lossless medium at normal incidence. In the medium its velocity reduces by 50% and in free space sets up a standing wave having a reflection coefficient of - 0.125. Calculate the permeability and the permittivity of the medium.
4
GATE ECE 1991
+2
-0.6
In a board side array of 20 isotropic radiators, equally spaced at a distance of $$\lambda /2$$, the veam width between first nulls is
A
51.3 degrees
B
11.46 degrees
C
22.9 degrees
D
102.6 degrees
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